580gtx

http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_580/1.html Wow, the 580 GTX beats the 5970 from ATi, a dual GPU. 580 is also a single GPU, which will consume less power, and generate less heat, and is 80$ cheaper, according to the review. Of course the 5970 beats it on higher...